Vren, the Relentless{2}{U}{B}

Legendary Creature — Rat Rogue

Ward {2}
If a creature an opponent controls would die, exile it instead.
At the beginning of each end step, create X 1/1 black Rat creature tokens with "This creature gets +1/+1 for each other Rat you control," where X is the number of creatures your opponents controlled that were exiled this turn.

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Illustrated by MAMEZAWA